Scarlett Johansson is designing a line of streetwear for Reebok, and tells InStyle in its new issue that the clothes are "fitted to my body. So I know they'll fit a regular person."

The 21-year-old Black Dahlia star says her favorite indulgence is a slice of veggie pizza and a Diet Coke or a wedge of homemade key lime pie . A typical dinner is Chinese takeout: "A little white rice, a little chicken, some egg drop soup …"

One thing she'd like to wear – someday – is a wedding gown. "Of course I want to get married, but I'm way too young," she says. "I'm not ready to sacrifice a lot of things in my lifestyle just to have an engagement ring."

She's mum on her boyfriend and Black Dahlia costar Josh Hartnett, but says the couple she's most like to double date with is David Bowie and Iman.